A DARK BRONZE GLASS COMPOSITION

摘要

The invention is a dark bronze soda-lime-silica glass composition having excellent ultra violet and infra red absorbing ability. The colorants of the glass composition consist essentially of: greater than 0.5 % total iron oxide as Fe2O3 with a maximum of 1.5 % Fe2O3, wherein the redox ratio of FeO/total Fe as Fe2O3 is less than 0.26; 0.10 to 1.00 wt.% manganese compound as MnO2; 0.0005 to 0.004 wt. % selenium as Se; up to 0.016 wt. % cobalt oxide as Co; the glass composition having, at 4.0 mm thickness: 570-585 dominant wavelength, 5-30 % purity of excitation, 20 to 65 % light transmittance using Illuminant A (LTA), less than 35 % ultra violet transmittance measured over 300-400 nm, and less than 46 % infrared transmittance measured over 760-2120 nm. At 20-50 % LTA, the excitation purity is 7-30 %, while above 50 % LTA, the excitation purity is 5-20 %. This glass is particularly useful for architectural applications.